Find the coefficient of `x^7` in the expansion of `(2x^2+- 1/x)^20`

Find the coefficient of x^(10) in the expansion of (2x^2-1/x)^(20) .

Find the coefficient of x^8 in the expansion of (x^2-1/x)^(10)

Find the coefficient of x^7 in the expansion of (3x^2+ 1/(5x))^11

Find the coefficient of x^9 in the expansion of (x^2-1/(3x))^9 .

Find the coefficient of x^9 in the expansion of (x^2-1/(3x))^9 .

Find the coefficient of x^24 in the expansion of (x^2-3a/x)^15 .

Find the coefficient of x^7 in the expansion of (x-1/(x^2))^(40) .

Find the coefficient of x^-7 in the expansion of (2x-1/(3x^2))^11 .

Find the coefficient of x^(7) in the expansion of (ax^(2) + (1)/(bx))^(11) . (ii) the coefficient of x^(-7) in the expansion of (ax + (1)/(bx^2))^(11) . Also , find the relation between a and b , so that these coefficients are equal .

Find the coefficient of x^7 in the expansion of (1 - x -x^2 + x^3)^(6)dot